Add support for webvtt subtitle

[Sopor]

When using the great add-on Retrospect i don't get any subtitle on every channel because they are now using webvtt instead of srt. The author of Retrospect told me this was the right place to ask for this and now i'm here :)

[basrieter]

To clarify this: I use the inputstream.adaptive add-on to play the m3u8 and mpd streams. For mpd the subs work just fine, for m3u8 they are not detected.

[JinRonin]

Are both using webvtt or m3u8 only? Just in case, can you please provide debug log and content of the m3u8/mpd.

[basrieter]

The M3u8 contains the url to the webvtt which contains multiple parts. I will try to find a log file tonight.

[JinRonin]

Guess log is not needed but the content of your m3u8.

Here are some samples with webvtt that can probably be used to add webvtt support.

https://devstreaming-cdn.apple.com/videos/streaming/examples/bipbop_16x9/bipbop_16x9_variant.m3u8 taken from https://developer.apple.com/streaming/examples/

http://cdnbakmi.kaltura.com/p/243342/sp/24334200/playManifest/entryId/0_uka1msg4/flavorIds/1_vqhfu6uy,1_80sohj7p/format/applehttp/protocol/http/a.m3u8 taken from https://knowledge.kaltura.com/webvtt-and-hls-captions-support

Subtitles are not shown with and without inputstream adaptive.

[basrieter]

Here is an actual stream: https://cmoreseusphlsvod24.akamaized.net/vod/895d4/yczgd1wzscy(3911406_ISMUSP).ism/yczgd1wzscy(3911406_ISMUSP).m3u8

it contains a link to a m3u8 with webvtt parts: https://cmoreseusphlsvod24.akamaized.net/vod/895d4/yczgd1wzscy(3911406_ISMUSP).ism/yczgd1wzscy(3911406_ISMUSP)-textstream_swe=1000.m3u8

I think this stream should be playable from all regions

[orfeous1]

Maybe i do not understand. But any updates on WebVTT support in the inputstream addon?

[gizmocuz]

@orfeous1,

I think this has to do with the following line:

https://github.com/peak3d/inputstream.adaptive/blob/b76c81fc4c2d7fd02e73c1d0091ae190351fc2fa/src/parser/HLSTree.cpp#L123

It will currently only accept audio types here

Not sure if this is done on purpose....

[Snaah]

Another user of Retrospect here, which uses the awesome InputStream Adaptive add-on. Is there by any chance some work in progress or plan to implement this? Would be great to have InputStream Adaptive being able to handle webvtt subtitles.

[CastagnaIT]

this has been fixed, on Nexus now there is full webvtt support